Top marker light of a truck vehicle



FIG. 1 is a left, front perspective view of a top marker light of a truck vehicle showing our new design;

FIG. 2 is a top view thereof;

FIG. 3 is a right, front perspective view thereof;

FIG. 4 is a left view thereof; and,

FIG. 5 is a right view thereof. 

The ornamental design for a top marker light of a truck vehicle, as shown and described. 